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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37935cc748a72cd2156dc6e8c1219e22082003b32b64dfea9476d54f853a5d0' 
  AND token = 'BBEC5bjH6ljBtLyWA+ycmbV61eY0EOmgjv288qZKymk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}